Answer :
Initial salary of Subba Rao is Rs. 5000
That is first term (a) = 5000
He receives Rs.200 every year as increment
So, common difference (d) = 200
The year when he reaches Rs. 7000
So, an = 7000
an = a +(n-1)d
7000 = 5000 + (n-1) 200
2000 = 200(n-1)
10 = n-1
n = 11
So, it takes him 11 years to reach Rs. 7000
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